Synopsis

Moderate: kernel-rt security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

Topic

Updated kernel-rt packages that fix three security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise MRG
2.5.

Red Hat Product Security has rated this update as having Moderate security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

A denial of service flaw was found in the way the Linux kernel's XFS file
system implementation ordered directory hashes under certain conditions.
A local attacker could use this flaw to corrupt the file system by creating
directories with colliding hash values, potentially resulting in a system
crash. (CVE-2014-7283, Moderate)

An out-of-bounds memory access flaw was found in the syscall tracing
functionality of the Linux kernel's perf subsystem. A local, unprivileged
user could use this flaw to crash the system. (CVE-2014-7825, Moderate)

An out-of-bounds memory access flaw was found in the syscall tracing
functionality of the Linux kernel's ftrace subsystem. On a system with
ftrace syscall tracing enabled, a local, unprivileged user could use this
flaw to crash the system, or escalate their privileges. (CVE-2014-7826,
Moderate)

Red Hat would like to thank Robert Święcki for reporting CVE-2014-7825 and
CVE-2014-7826.

The kernel-rt packages have been upgraded to upstream version 3.10.58,
which provides a number of bug fixes and enhancements over the previous
version. (BZ#1158105)

This update also fixes the following bugs:

• Automatic NUMA balancing on a low priority thread could cause memory
  contention with a high priority thread running in the same process.
  This contention could trigger poor realtime performance on the system.
  In order to avoid this potential memory contention, the MRG Realtime kernel
  now disables NUMA_BALANCING_DEFAULT_ENABLED. (BZ#1158940)
  
• When tracing a bug, WARN*() functions could flood the ring buffer making
  the trace useless or even overflowing the ring buffer. To address this
  issue, a traceoff_on_warning option was added to the kernel command line
  and as a sysctl option. This option disables the writing of the warning
  messages to the ring buffer, which results in a cleaner trace for
  debugging. (BZ#1155200)
  

In addition, this update adds the following enhancement:

• Support for XHCI (USB 3) is now enabled in the MRG Realtime kernel.
  (BZ#1134095)
  

All kernel-rt users are advised to upgrade to these updated packages, which
contain correct these issues and add these enhancements. The system must be
rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

To install kernel packages manually, use "rpm -ivh [package]". Do not use
"rpm -Uvh" as that will remove the running kernel binaries from your
system. You may use "rpm -e" to remove old kernels after determining that
the new kernel functions properly on your system.

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 1134095 - Enable XHCI (USB 3.0) for MRG
• BZ - 1148777 - CVE-2014-7283 kernel: xfs: directory hash ordering denial of service
• BZ - 1158105 - rebase to latest upstream stable 3.10 kernel
• BZ - 1161565 - CVE-2014-7825 CVE-2014-7826 kernel: insufficient syscall number validation in perf and ftrace subsystems

CVEs

• CVE-2014-7283
• CVE-2014-7826
• CVE-2014-7825

References

• https://access.redhat.com/security/updates/classification/#moderate

MRG Realtime 2

SRPM
kernel-rt-3.10.58-rt62.58.el6rt.src.rpm	SHA-256: 8e905b6c2d38484898862044db129234d7c6db94f63d88a89fb650d9727efada
x86_64
kernel-rt-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 79381298809bf0c88516c0481b707b7aa1e6af6f143261e6b87e13ecc7e6aee2
kernel-rt-debug-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 214cbb65a589a67045d79461667a653afe16eb119508e5f2896c467374fd0df2
kernel-rt-debug-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: b11a686bd878cabd6a32cd22b5441e38d15d13ff784c518fcf6ce9e3ded92023
kernel-rt-debug-devel-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: e247462fb637cbee5369ef429b0b7375314ca61972a0313398da9e10e1a4d35c
kernel-rt-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 6b6b29c9221dc792ea2659cccfe7042bfe2434a4ac847facb76679913fe0c7c5
kernel-rt-debuginfo-common-x86_64-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 53d1a0e742ea313e409dbc77c7b96e92b79cd6df5774850d94734d1cc81fc730
kernel-rt-devel-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 3d8cdfb38a18cfe5997dc112f5e00581667bd95ba42037b23f688b0f2e2d320c
kernel-rt-doc-3.10.58-rt62.58.el6rt.noarch.rpm	SHA-256: ca92a65932edcc1f9565f5472b57a3bc626eec004be21c276157fb40a24fe3b9
kernel-rt-firmware-3.10.58-rt62.58.el6rt.noarch.rpm	SHA-256: a3d8432387d1d1df5eb5fbf5b6cba982623258ab1832c24dee7be3da7ecd7103
kernel-rt-trace-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 3f4a9ae56ba951b6619348f80141d09e749dd058a6a8cc10bffddf012dc99e11
kernel-rt-trace-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: d39e2d522fbe87920c1090cc83508b09f68c4f52b4a7e4d742c9bd67658b0611
kernel-rt-trace-devel-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 91519411c54d98cebb05cd5878afc2d9683490c5a91e48f867cf97764a6ff881
kernel-rt-vanilla-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: bee0c4ed962d11cca0df0086af4b1812c0f9e0c4d1eb18cb94f0a0b027af4dc9
kernel-rt-vanilla-debuginfo-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 0fe730e9ee8d9d60f1c62b94c380e86ad347c733843e299026b5767c6df6630c
kernel-rt-vanilla-devel-3.10.58-rt62.58.el6rt.x86_64.rpm	SHA-256: 2cfc07cef22e10eafff83f9708970e48f016294afe136bcaa56fdde0904b9455